israel says more than 300 rockets have been launched into israel since this escalation began. almost half of them have been stopped by the iron dome anti-missile system, which you can see working here in this video. meanwhile, some 16,000 reservists have been called up, as tanks and troops mass along the gaza border, preparing for a possible ground invasion. so, now, three days into this huge escalation of violence, no sign that either side is backing down. josh? >> a potentially perilous escalation. alex marquardt in gaza. >>> here at home, a security scare at the airport in phoenix overnight. a woman with a small child in her car, crashed through a gate and drove on to an active runway. flights had to be stopped for some 15 minutes as police tried to get her to stop. they would only say she appeared to be impaired. no flights, though, were in danger. >>> and oil giant bp will pay a record $4.5 billion to settle criminal charges stemming from the 2010 gulf oil spill. three of its former employees will not be covered under the deal. the justice department is charging two forme